An endocytosis defect as a possible cause of proteinuria in polycystic kidney disease.

An endocytosis defect as a possible cause of proteinuria in polycystic kidney disease.
复制标题

内吞作用缺陷可能是多囊肾病蛋白尿的原因。

DOI:
--
复制
发表时间:
2001
期刊:
AJP - Renal Physiology
影响因子:
--
通讯作者:
R. Witzgall
R. Witzgall
中科院分区:
--
文献类型:
--
作者:
N. Obermüller;B. Kränzlin;W. Blum;N. Gretz;R. Witzgall

文献摘要

参考文献

被引文献

相似文献

由于蛋白尿已在常染色体显性多囊肾病(ADPKD)患者中得到证实,我们研究了蛋白尿是否也发生在(cy/+)大鼠中,这是一种广泛使用的ADPKD模型。在16周龄(cy/+)大鼠中可发现尿蛋白排泄增加,特别是白蛋白排泄增加,其凝胶电泳模式与蛋白尿的肾小管起源一致。使用FITC标记的葡聚糖作为肾小管内体功能的体内示踪剂,我们可以表明,近端小管的囊肿衬里上皮细胞的部分已经失去了内吞的能力,这是必要的低分子量蛋白质的重吸收。通过免疫组织化学,其他蛋白质的表达涉及内吞作用,如氯离子通道ClC-5和白蛋白受体巨蛋白,以及相关的存在和不存在的FITC-葡聚糖在囊肿。作为生长因子系统可能受到这种内吞缺陷影响的一个例子,我们可以检测到(cy/+)动物尿中胰岛素样生长因子-I蛋白水平的增加。这些数据表明,上述ADPKD大鼠模型中的蛋白尿和白蛋白尿是由于近端肾小管囊肿上皮细胞内吞机制的丧失。这也可能影响囊液中不同生长因子和激素的浓度,从而调节囊肿发育。
Because proteinuria has been demonstrated in patients with autosomal-dominant polycystic kidney disease (ADPKD), we have investigated whether proteinuria also occurs in the (cy/+) rat, a widely used model for ADPKD. Increased urinary excretion of proteins, in particular of albumin, can be found in 16-wk-old (cy/+) rats, with a gel electrophoresis pattern compatible with a tubular origin of proteinuria. Using FITC-labeled dextran as an in vivo tracer for renal tubular endosomal function, we could show that portions of cyst-lining epithelia from proximal tubules have lost the ability to endocytose, which is necessary for the reabsorption of low-molecular-weight proteins. By immunohistochemistry, the expression of other proteins implicated in endocytosis, such as the chloride channel ClC-5 and the albumin receptor megalin, correlated well with the presence and absence of FITC-dextran in cysts. As an example of growth factor systems possibly being affected by this endocytosis defect, we could detect increased urinary levels of insulin-like growth factor-I protein in (cy/+) animals. These data indicate that proteinuria and albuminuria in the aforementioned rat model for ADPKD are due to a loss of the endocytic machinery in epithelia of proximal tubular cysts. This may also affect the concentration of different growth factors and hormones in cyst fluids and thus modulate cyst development.
DOI: 10.1152/ajprenal.1995.268.3.f398
发表时间: 1995-03-01
影响因子: 4.2
作者:
BACHINSKY, DR;SABOLIC, I;PERRONE, RD
通讯作者: PERRONE, RD
DOI: 10.1006/abio.1996.0171
发表时间: 1996-05-01
影响因子: 2.9
作者:
Zor, T;Seliger, Z
通讯作者: Seliger, Z
DOI: 10.1152/ajprenal.1996.271.1.f169
发表时间: 1996-07-01
影响因子: 4.2
作者:
Devuyst, O;Burrow, CR;Wilson, PD
通讯作者: Wilson, PD
低密度脂蛋白受体相关蛋白和 gp330 结合相似的配体,包括纤溶酶原激活剂-抑制剂复合物和乳铁蛋白(一种乳糜微粒残留清除抑制剂)。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Willnow,TE;Goldstein,JL;Orth,K;Brown,MS;Herz,J
通讯作者: Herz,J
DOI: --
发表时间: 1994-12
期刊: Journal of the American Society of Nephrology : JASN
影响因子: --
作者:
Arlene B. Chapman;Ann M. Johnson;P. Gabow;Robert W. Schrier
通讯作者: Arlene B. Chapman;Ann M. Johnson;P. Gabow;Robert W. Schrier